I bought it to fully charge a completely dead battery in a two-liter ford fiesta. At first, I was disappointed because no matter how I connected the charger to the battery and the power, it stubbornly showed that the battery was 100% full. Then I thought of trying it on a car with a healthy battery, where it worked fine. So I put it back in the fiesta, it showed 100% fullness again on the empty battery, but in about ten minutes it recovered, started working with accurate indications, and fully charged it in about 16 hours.
I am very satisfied with the price-performance ratio, as long as it continues to work when I need it.

I had bought from an international eshop 4 years ago, I maintain car, scooter, and motorcycle batteries. Without any problem. I recommend having it as a tool at home.

For batteries from 12Ah to 100Ah, why is this not stated in the specifications? It is essential.
I saw in other reviews that it was used for larger batteries, but I used it for a 120Ah battery in excellent condition and it overcharged it. Thankfully, it is an open type and I topped up the (deionized) water that evaporated, but it wasn't the best for the battery.
For the connection (if I understood the terrible English of the manual correctly), we plug it into the socket, the green LED lights up, and then we connect it to the battery. When the battery is fully charged, FIRST we unplug it from the socket and then disconnect the battery.

Well, I have charged a 12V Varta 180ah car battery for about 60 hours so far, and also a 3-hour charge for my 12V motorcycle. For 11 euros, it's simply perfect. The voltage and ampere readings are accurate when measured with a multimeter. It ramps up the voltage correctly as it charges. I have charged the battery from completely empty and everything is fine, it took about 16-20 hours to charge. Generally, I charge it on the balcony because, well, it's Chinese so I don't fully trust it and I don't want it to burn down my house! Don't forget to connect the battery first and then the power!!

It was used in a deep discharge sealed battery. It does exactly what it says. The fan is relatively noisy and may be annoying if it is in a quiet space. That's also the reason why it loses one star. However, for its price, it is very good.

It is very good for its price. The voltage it targets is 13.5v and not 14.5-15v like others, without putting pressure on the battery, which makes it ideal for permanent maintenance. The second thing that makes it ideal for my case is that you don't need to press any button to start charging, for example if the power is cut off and you don't notice it, other chargers will stop the supply even if the power comes back. With this charger, as soon as the power comes back, the maintenance continues normally without you having to deal with it.

Good charger in the first phase, I give it 4 stars as I don't know its durability over time. I will come back after some time for re-evaluation.

Buy it.

I placed the order hesitantly because of the price. "Is it any good?" I was wrong, the charger is worth every penny.

It arrived, I unpacked it, it is very lightweight, the clamps are small but they fit very well on the poles. It's better that they are small because in some cars access to the poles is limited.

The first battery I charged was at 2%, almost dead. It brought it up to 80% in a few minutes (~10-15). Then I realized that the battery was 5 years old (okay, I replaced the battery after 10 days). The second battery I charged was a worn-out 2-year-old due to inactivity (COVID) and it went to 100% in 2 minutes.

The system, I recommend without reservation.

update. After 5-6 uses, it gave up. Unfortunately, the machine, although nice, is not reliable. So be careful.